posterior extremity

例句：

1. 1. The scientist studied the anatomy of the animal's posterior extremity.
   这位科学家研究了动物后部的解剖结构。
2. 2. The team was able to move forward by using their posterior extremities.
   通过使用他们的后肢，团队能够前进。
3. 3. The researcher discovered that the animal had a unique way of moving its posterior extremities.
   研究者发现这种动物有一种独特的移动后部肢体的方式。